I ran an advanced diagnositc on my '98 3.4 today. It showed that the engine temp (ECT) was 221 degrees. The gauge on the dash is normal. The temp taken by infrared at the water neck was 175. Are there tow seperate sending units on this engine like there is on the 22RE? If so, I hope the one for the ECM is just behind the timing cover on top of the engine near the fuel rail. Am I right? Thanks guys.

 

You are right. There are two. The water temp sender is at the back of the top side of the engine. It feeds the temp gauge on the cluster. The engine coolant temperature sensor that supplies the signal to the ECU is located at the front of the engine near the fuel rail on the passenger side.

 

is the coolant temperature sensor on a 94 toyota pickup with a 22RE in the same location? I can't find it on my pickup.....i don't really know what it looks like for that matter. I assume like a knock sensor???

 

I believe this is the front coolant temp sensor on my 5VZ:


Note pic was taken with intake manifold removed.

 

I can not find the temp sensor on my gf's 2.7l 4runner do you know where that may be? Really be awesome to get this thing going again